
Hi,
I have suffered this alot with my briard, he chews and chews his paw until it is red and sore and starting to lose hair:-( over time I have worked out that it is grass seeds that get stuck in the pads and cos they are so small they cant always chew them out. Does your dog walk on any grass?? The spores are so small you would need a microscope to see them and often when you take them out there is a little bit of pus that comes after it, where it has caused a minor infection, nothing to worry about though, just bathe it for a few days with boiled salted water to clear up any mess. If this doesnt seem to be your problem, look for allergys to something that he/she has walked on or in, its really a case of looking closely at the paws and seeing what you can see. Is it a recent thing or has been going on for a while? if it is recent its probably some foreign body or allergy, if it has been going on for a while, it could be boredom/behavioural, albeit you probably think its out of character they can do these things and we dont understand it:-)
Hope this helps,
Jo